LOS ANGELES -- Sandy Boss, the former wife of a man who called himself Clark Rockefeller, will testify for the prosecution at his murder trial, sources close to the case said Thursday.

In 1995 Boss, a Harvard Business School graduate married a man who told her he was a Rockefeller and descendant of the 19th Century oil baron. In reality the man was Christian Karl Gerhartsreiter, a German national.

Boss' name was included on a list of witnesses provided last week to prospective jurors in the case, who were told the list included both potential witnesses and names that might come up during testimony in the case.

The date of her testimony has not been determined, but the sources said she is making arrangements to travel to Los Angeles to testify.

Gerhartsreiter is accused of killing John Sohus, 27, cutting up his body in three parts and burying the pieces in the backyard of a San Marino home during 1985.

He and Boss had a child together, Reigh "Snooks" Boss. The couple were divorced in 2007. When Gerhartsreiter refused to provide proof of his identity, he lost custody of the child and was given limited visitation rights.

During a supervised visit with his daughter in 2008, Gerhartsreiter kidnapped the girl and fled from Boston to Baltimore, where he had assumed the identity of Chip Smith. He was arrested by the FBI and convicted in the case receiving a four-to-five year sentence.

Boss, 45, is a senior partner for London-based McKinsey and Company. She grew up in Seattle and met Gerhartsreiter in 1994 at a Clue party. He came dressed as the character "Professor Plum" she came as "Miss Scarlet."